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Updated: May 21, 2025
He startled the world by the publication of his first book, Sidereus Nuntius, in which he disclosed his important astronomical discoveries, amongst others the satellites of Jupiter and the spots on the sun.
This work, under the title of "Nuncius Sidereus," or the "Sidereal Messenger," was dedicated to the same prince; and the dedication bears the date of the 24th of March, only two days after he concluded his observations. The importance of this great discovery was instantly felt by the enemies as well as by the friends of the Copernican system.
They have long ceased to be known by that name; but so highly prized was the distinction thus conferred upon the ducal house of Florence, that Galileo received an intimation that he would "do a thing just and proper in itself, and at the same time render himself and his family rich and powerful forever," if he "named the next star which he should discover after the name of the great star of France, as well as the most brilliant of all the earth," Henry IV. These discoveries were made known in 1610, in a work entitled "Nuncius Sidereus," the Newsman of the Stars; in which Galileo further announced that he had seen many stars invisible to the naked eye, and ascertained that the nebulæ scattered through the heavens consist of assemblages of innumerable small stars.
Selenography, as a branch of observational astronomy, dates from the spring of 1609, when Galileo directed his "optic tube" to the moon, and in the following year, in the Sidereus Nuncius, or "the Intelligencer of the Stars," gave to an astonished and incredulous world an account of the unsuspected marvels it revealed.
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